The calculated distance (air line) between Dayr al Balaḩ and Janīn is approximately 91 miles respectively 147 kilometers.
By car or train, the actual journey to Janīn is certainly longer, as only the direct route (as the crow flies) between Dayr al Balaḩ and Janīn has been calculated here.
Air line (approximately)
147 kilometers
79 nautical miles